Shear sharpening device



Aug. 23. 1932. A. A. EMERY 1,873,636

SHEAR SHARPENING DEVICE Filed Nov. 15, 1931 y -e ZZ abbomwq PatentedAug. 23, 1932 UNITE STATES FATE SHEAR sHARPEmnG nEvroE Application filedNovember 13, 1931; Serial No. 574,809.

This invention relates to a shear sharpening device. 7

Among the objects of the invention are to provide means whereby anunskilled person may sharpen a pair of shear blades; to provide suchmeans wherein a pair of shear blades may be successively held inidentical position in order that a corresponding bevel may be formed onthe blades by the passage thereover of a sharpening tool; to providesuch a means which is adjustable to shear blades of varying lengths; andto provide the foregoing features in a shear sharpening device which isof simple and inexpensive construction. Y

Other objects and advantages of the invention will be apparent from thefollowing clescription, considered in connection with the accompanyingdrawing, in which? Figure 1 is a top plan of a shear sharpening devicein accordance with this invention.

Figure 2 is an enlarged section taken substantially on the line 22 ofFigure 1.

Figure 3 is an enlarged section taken substantially on the line 3-3 ofFigure 1.

Figure 4 is an enlarged section taken substantially on the line 44 ofFigure 1.

Figure 5 is an enlarged section taken substantially on the line 55 ofFigure 1.

Referring to the drawing in detail, the numeral 1 indicates a basepreferably in the form of a rectangular block supported on suitablebuttons 2. At one end thereof, the block 1 is formed in its upper facewith a recess 3 for receiving a metal plate 4 extending transversely ofthe block. One end of the plate 4 is formed with an enlargement 5 whichis of materially greater thickness than the body portion of the plate,and an inner portion of which fits within a recess 6 in a side face ofthe block 1.

The enlargement 5 is formed with a notch 7 which extends verticallythrough the enlargement and opens through the outer side face thereof.The notch 7 is formed with opposing angular walls, one of which has alower inclined portion 8, and the other of which has an upper inclinedportion 9. The inclined portions 8 and 9 extend in parallel, inclinedplanes. The enlargement 5 is formed with stops 10 and 11 at the outerextremities of the inclined wall portions 8' and 9 respectively.

Formed in the upper face of the plate 4', and opening into the notch 7between the in clined planes of the wall portions 8 and 9 is an inwardlytapering groove 12 which opens at its inner end into an elongated slot18 extending lengthwise of the plate 4. Slidably mounted on the plate 4is a tapered adjustable member 14 formed with a groove 15 disposed inalignment with the groove 12. Depending from the member 14, and extending through the slot 18, isa lug 16 which is apertured to receivetherethrough a bolt 17. The bolt 17 extends through a recess 18 inthe'block 1 beneath the plate 4, and is pro vided with "a nut 19 andwasher 20 for engagement with the block 1 and plate 4 to maintain themember 14in adjusted position with respect to the length of the groove12.

In the use of the device, one shear blade, such as 21, is extendedthrough the notch 7 in engagement with the inclined wall portions 8 and9. The other shear blade, such as 22, is disposed within the grooves 12and 15, the member 14 being adjusted in accordance with the length ofthe blade 22. A sharpening tool, such as a file indicated at 23 is thendrawn transversely against the blade 22 in order to form the cuttingedge of the latter with a bevel 24 which is parallel to the upper faceof the block 1. Preferably the file 23 will be provided with a handlemember 25 which is of appropriate thickness to maintain the file inparallel relation to the block 1 when the handle member 25 is seated onthe block. After the blade 22 has been sharpened, the positions of theblades 21 and 22 are reversed in order that, 0

the blade 21 may be sharpened in the same manner. The blade which isbeing sharpened is always maintained at the same inclination whendisposed within the grooves 12 and 15, owing to the contact of the otherblade with the inclined wall portions 8 and 9 'of the notch 7,consequently the bevel formed on the blade by the reciprocation of thetool 23 in a line parallel to the upper face of the block 1 necessarilywill be of the same pitch.

While the embodiment of the invention herein illustrated and describedis to be considered as a preferred example of the same, it is to beunderstood that changes in the details of construction may be made, solong as such changes fall within the scope of the appended claims.

I claim:

1. In ashear sharpening device, a supporting block formed adjacent oneend with a recess, a plate disposed within said recess and extendingtransversely of the bolck, an enlargement on one end of the plate formedwith a blade receiving notch, said plate having its upper face formedwith an inwardly tapering groove with its outer end in communicationwith said notch, said plate further being formed with a lengthwiseextending slot in communication with the inner end of said groove, aslidable member mounted on the plate and having a lug eX- tendingthrough said slot, a bolt extending through said lug, and tighteningmeans on the bolt for engagement with the block and plate.

2. In a shear sharpening device, a supporting block formed adjacent oneend with a recess, a plate disposed within said recess and extendingtransversely of the block, an enlargement on one end of the plate formedwith a blade receiving notch, said plate having its upper face formedvith an inwardly tapering groove with its outer end in communicationwith said notch, said plate further being formed with a lengthwiseextending slot in communication with the inner end of said groove, aslidable member mounted on the plate and having a lug extending throughsaid slot, a bolt extending through said lug, and tightening means onthe bolt for engagement with the block and plate, said notch havingopposite wall portions extending in inclined, parallel planes.

In testimony whereof, I afiiX my signature hereto,

ALEXANDER A. EMERY.

